The ZDDC30-K0144 from Mini Circuits is a Dual Directional Coupler with Coupling 30 dB, Coupling Variation ±0.7 to 1 dB( Flatness), Frequency 1 to 40 GHz, Power 20 W, Insertion Loss 0.2 to 1.6 dB. Tags: Module with Connectors. More details for ZDDC30-K0144 can be seen below.